TMP17FS-TMP17GS Fast Delivery |IC PHOENIX CO.,LIMITED

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TMP17FS-TMP17GS
Low Cost, Current Output Temperature Transducer

TMP17F/G–SPECIFICATIONS
NOTESAn external calibration trim can be used to zero the error @ 125°C.Defined as the maximum deviation from a mathematically best fit line.Maximum deviation between 125°C readings after a temperature cycle between 240°C and 1105°C. Errors of this type are noncumulative.Operation at 1150°C. Errors of this type are noncumulative.
Specifications subject to change without notice.
(VS = 15.0 V, 2408C ≤ TA ≤ 1058C, unless otherwise noted)
ORDERING GUIDE
TMP17FS
ABSOLUTE MAXIMUM RATINGS*
Maximum Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . 130 V
Operating Temperature Range. . . . . . . . . . 240°C to 1105°C
Maximum Forward Voltage (1 to 2). . . . . . . . . . . . . . 144 V
Maximum Reverse Voltage (2 to 1). . . . . . . . . . . . . . . 120 V
Dice Junction Temperature. . . . . . . . . . . . . . . . . . . . . 1175°C
Storage Temperature Range. . . . . . . . . . . . 265°C to 1160°C
Lead Temperature (Soldering, 10 sec). . . . . . . . . . . . 1300°C
NOTES
*Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation at or above this specification is not implied. Exposure to the above
maximum rating conditions for extended periods may affect device reliability.
TEMPERATURE SCALE CONVERSION EQUATIONS
K = 8C 1 273.158F = 8C 1 3298C = (8F 2 32)5
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
METALIZATION DIAGRAM
TEMPERATURE – 125
TEMPERATURE ERROR – 255075100
Figure 2.Accuracy vs. Temperature
TIME – sec
PERCENT OF CHANGE – %152025
Figure 3.Thermal Response in Stirred Oil Bath
AIR VELOCITY – FPM600100
TIME CONSTANT – sec
200300400500
Figure 4.Thermal Time Constant in Forced Air
TEMPERATURE –
TOTAL ERROR –
Figure 5.Long-Term Stability @ 1125°C
SUPPLY VOLTAGE – V
OUTPUT CURRENT – µA
150
Figure 6.V-I Characteristics
Figure 7.Output Turn-On Settling Time
TMP17
THEORY OF OPERATION
The TMP17 uses a fundamental property of silicon transistors
to realize its temperature proportional output. If two identical
transistors are operated at a constant ratio of collector current
densities, r, then the difference in base-emitter voltages will be
(kT/q)(ln r). Since both k, Boltzmann’s constant, and q, the
charge of an electron, are constant, the resulting voltage is
directly Proportional To Absolute Temperature (PTAT). In the
TMP17 this difference voltage is converted to a PTAT current
by low temperature coefficient thin film resistors. This PTAT
current is then used to force the total output current to be
proportional to degrees Kelvin. The result is a current source
with an output equal to a scale factor times the temperature (K)
of the sensor. A typical V-I plot of the circuit at 125°C and the
temperature extremes is shown in Figure 6.
Factory trimming of the scale factor to 1μA/K is accomplished
at the wafer level by adjusting the TMP17’s temperature
reading so it corresponds to the actual temperature. During
laser trimming the IC is at a temperature within a few degrees of
125°C and is powered by a 5V supply. The device is then
packaged and automatically temperature tested to specification.
FACTORS AFFECTING TMP17 SYSTEM PRECISION
The accuracy limits given on the Specifications page for the
TMP17 make it easy to apply in a variety of diverse applica-
tions. To calculate a total error budget in a given system it is
important to correctly interpret the accuracy specifications, non-
linearity errors, the response of the circuit to supply voltage
variations and the effect of the surrounding thermal environ-
ment. As with other electronic designs external component
selection will have a major effect on accuracy.
CALIBRATION ERROR, ABSOLUTE ACCURACY AND
NONLINEARITY SPECIFICATIONS
Two primary limits of error are given for the TMP17 such that
the correct grade for any given application can easily be chosen
for the overall level of accuracy required. They are the calibra-
tion accuracy at 125°C, and the error over temperature from
240°C to 1105°C. These specifications correspond to the
actual error the user would see if the current output of a
TMP17 were converted to a voltage with a precision resistor.
Note that the maximum error at room temperature or over an
extended range, including the boiling point of water, can be
directly read from the specifications table. The error limits are a
combination of initial error, scale factor variation and non-
linearity deviation from the ideal 1μA/K output. Figure 2
graphically depicts the guaranteed limits of accuracy for a
TMP17GS.
The TMP17 has a highly linear output in comparison to older
technology sensors (i.e., thermistors, RTDs and thermo-
couples), thus a nonlinearity error specification is separated
from the absolute accuracy given over temperature. As a
maximum deviation from a best-fit straight line this specification
represents the only error that cannot be trimmed out. Figure 8
is a plot of typical TMP17 nonlinearity over the full rated
temperature range.
NONLINEARITY –
TEMPERATURE – 0
Figure 8.Nonlinearity Error (TMP17)
TRIMMING FOR HIGHER ACCURACY
Calibration error at 125°C can be removed with a single
temperature trim. Figure 9 shows how to adjust the TMP17’s
scale factor in the basic voltage output circuit.
Figure 9. Basic Voltage Output (Single Temperature Trim)
To trim the circuit the temperature must be measured by a
reference sensor and the value of R should be adjusted so the
output (VOUT) corresponds to 1mV/K. Note that the trim
procedure should be implemented as close as possible to the
temperature highest accuracy is desired for. In most applications
if a single temperature trim is desired it can be implemented
where the TMP17 current-to-output voltage conversion takes
place (e.g., output resistor, offset to an op amp). Figure 10
illustrates the effect on total error when using this technique.
TOTAL ERROR –
ment (θJA). Self-heating error in °C can be derived by multiply-
ing the power dissipation by θJA. Because errors of this type can
vary widely for surroundings with different heat sinking capaci-
ties, it is necessary to specify θJA under several conditions.
Table I shows how the magnitude of self-heating error varies
relative to the environment. In typical free air applications at
125°C with a 5V supply the magnitude of the error is 0.2°C or
less. A small glued-on heat sink will reduce the temperature
error in high temperature, large supply voltage situations.
Table I.Thermal Characteristics
NOTES
*τ is an average of one time constant (63.2% of final value). In cases where the
thermal response is not a simple exponential function, the actual thermal
response may be better than indicated.
Response of the TMP17 output to abrupt changes in ambient
temperature can be modeled by a single time constant τ
exponential function. Figures 3 and 4 show typical response
time plots for media of interest.
The time constant, τ, is dependent on θJA and the thermal
capacities of the chip and the package. Table I lists the effective
τ (time to reach 63.2% of the final value) for several different
media. Copper printed circuit board connections will sink or
conduct heat directly through the TMP17’s soldered leads.
When faster response is required a thermally conductive grease
or glue between the TMP17 and the surface temperature being
measured should be used.
MOUNTING CONSIDERATIONS
If the TMP17 is thermally attached and properly protected, it
can be used in any temperature measuring situation where the
maximum range of temperatures encountered is between 240°C
and 1105°C. Thermally conductive epoxy or glue is recom-
mended under typical mounting conditions. In wet environ-
ments condensation at cold temperatures can cause leakage
current related errors and should be avoided by sealing the
device in nonconductive epoxy paint or conformal coating.
APPLICATIONS
Connecting several TMP17 devices in parallel adds the currents
through them and produces a reading proportional to the
average temperature. Series TMP17s will indicate the lowest
temperature because the coldest device limits the series current
flowing through the sensors. Both of these circuits are depicted
in Figure 13.
If greater accuracy is desired, initial calibration and scale factor
errors can be removed by using the TMP17 in the circuit of
Figure 11.
5kΩ
+5V
REF43
Figure 11.Two Temperature Trim Circuit
With the transducer at 0°C adjustment of R1 for a 0V output
nulls the initial calibration error and shifts the output from K to
°C. Tweaking the gain of the circuit at an elevated temperature
by adjusting R2 trims out scale factor error. The only error
remaining over the temperature by adjusting R2 trims out scale
factor error. The only error remaining over the temperature
range being trimmed for its nonlinearity. A typical plot of two
trim accuracy is given in Figure 12.
SUPPLY VOLTAGE AND THERMAL ENVIRONMENT
EFFECTS
The power supply rejection characteristics of the TMP17
minimize errors due to voltage irregularity, ripple and noise. If a
supply is used other than 5V (used in factory trimming), the
power supply error can be removed with a single temperature
trim. The PTAT nature of the TMP17 will remain unchanged.
The general insensitivity of the output allows the use of lower
cost unregulated supplies and means that a series resistance of
several hundred ohms (e.g., CMOS multiplexer, meter coil
resistance) will not degrade the overall performance.
TEMPERATURE –
TOTAL ERROR –
Figure 12.Typical Two Trim Accuracy
The thermal environment in which the TMP17 is used deter-
mines two performance traits: the effect of self-heating on
accuracy and the response time of the sensor to rapid changes in
TMP17
+5V
333.3Ω10kΩ
(0.1%)
+15V
Figure 13.Average and Minimum Temperature
Connections
The circuit of Figure 14 demonstrates a method in which a
voltage output can be derived in a differential temperature
measurement.
10kΩ
(10mV/oC)
Figure 14.Differential Measurements
R1 can be used to trim out the inherent offset between the two
devices. By increasing the gain resistor (10kΩ) temperature
measurements can be made with higher resolution. If the
magnitude of V1 and V2 is not the same, the difference in
power consumption between the two devices can cause a
differential self-heating error.
Cold junction compensation (CJC) used in thermocouple signal
conditioning can be implemented using a TMP17 in the circuit
configuration of Figure 15. Expensive simulated ice baths or
hard to trim, inaccurate bridge circuits are no longer required.
The circuit shown can be optimized for any ambient tempera-
ture range or thermocouple type by simply selecting the correct
value for the scaling resistor – R. The TMP17 output (1μA/K)
times R should approximate the line best fit to the thermocouple
curve (slope in V/°C) over the most likely ambient temperature
range. Additionally, the output sensitivity can be chosen by
selecting the resistors RG1 and RG2 for the desired noninverting
gain. The offset adjustment shown simply references the
TMP17 to °C. Note that the TC’s of the reference and the
resistors are the primary contributors to error. Temperature
rejection of 40 to 1 can be easily achieved using the above
technique.
Although the TMP17 offers a noise immune current output, it
is not compatible with process control/industrial automation
current loop standards. Figure 16 is an example of a tempera-
ture to 4–20mA transmitter for use with 40V, 1kΩ systems.
In this circuit the 1μA/K output of the TMP17 is amplified tomA/°C and offset so that 4mA is equivalent to 17°C andmA is equivalent to 33°C. Rt is trimmed for proper reading
at an intermediate reference temperature. With a suitable choice
of resistors, any temperature range within the operating limits of
the TMP17 may be chosen.
TMP17
REF01E
+20V
–20V
Figure 16.Temperature to 4–20mA Current Transmitter
Reading temperature with a TMP17 in a microprocessor based
system can be implemented with the circuit shown in Figure 17.
+5V
REF43
RGAINROFFSET
Figure 17.Temperature to Digital Output
By using a differential input A/D converter and choosing the
current to voltage conversion resistor correctly, any range of
temperatures (up to the 145°C span the TMP17 is rated for)

Partno	Mfg	Dc	Qty	Available	Descript
TMP17FS	ADI	N/a	83	avai	Low Cost, Current Output Temperature Transducer
TMP17GS	ADI	N/a	11	avai	Low Cost, Current Output Temperature Transducer